System roof

ABSTRACT

A system roof for prefabricated building construction has a pair of rafter beams, which are provided at end parts with couplings. The opposite end parts have vertically directed posts for connection to a gable wall. The pairs of rafter beams are connected to each other by means of running joists. Such a system roof can be used for construction of a building or for interchange with an existing roof.

The invention relates to a system roof.

BACKGROUND OF THE INVENTION

Field of the Invention

Known from EP-A-0 006 257 is a skeleton structure for a prefabricatedbuilding construction. Used as roof in such a skeleton structure arerafters which are disposed in pairs and of which the mutually facing endparts are joined to each other by a connecting construction. In additionthe rafters of a pair are mutually joined by a horizontal joist in orderto obtain the required stiffness. From DE-A-33 30 992 a structure asdescribed in the preamble of claim 1 is known.

From GB-A-552,283 a roof system is known in which end parts of rafterbeams are hingedly connected to substantially horizontal channel plates.Such a roof system lacks the necessary stiffness.

The invention has for its object to improve the known roof construction.

SUMMARY OF THE INVENTION

Rapid erection becomes possible with such a roof construction, while amaterial saving is further achieved relative to the known roofconstruction. The horizontal joist between the rafter beams forming apair is omitted in the roof construction according to the presentinvention. In addition, it is possible with the present roofconstruction according to the invention to erect an attic story since itis possible to opt for a greater distance between the attic floor andthe rafter beams. The attic floor serves herein as horizontally directedconnection between the rafter beams of a pair. The posts can have adesired length with which the height of the attic story can then bedetermined.

The connection between the post and a gable wall can be formed by aU-shape directed toward the gable wall. The gable wall can be erectedfurther than the attic floor, which is another option for setting theheight of the attic story.

The coupling means preferably consist of a standing plate welded to eachrafter beam and a nut-bolt connection joining together the adjoiningplates. For further stiffening of the roof construction a secondvertical post can be arranged on a rafter beam at a distance from thefirst post, which second post then rests on the attic floor.

For the end gable use can be made of a hip rafter pair, wherein mutuallyfacing end parts of the pair then have vertically directed plates whichare provided with nut-bolt connections. At such a roof point aconnection can be effected between a rafter beam pair and a hip rafterpair by means of coupling the welded-on vertical plates.

The invention will be elucidated with reference to an embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of a multi-story dwelling with a roofconstruction according to the invention, and

FIG. 2 shows in perspective view a detail of the roof construction ofthe embodiment of FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

The multi-story dwelling comprises vertical steel posts, for instance 1,2 which are mutually braced by means of struts, for instance 3, 4. Thetop ends of the posts are mutually joined by horizontal joists 5, 6. Theintermediate spaces between the posts are walled up with bricks orblocks 7 or contain windows 8 or door openings 9. According to theinvention a roof construction consists of pairs 10, 11, 12 of rafters.The mutually facing end parts of each pair are provided with verticallyoriented, upright, welded-on plates 13, 14 which are mutually coupled bya nut-bolt connection 15. On the end parts each rafter beam has avertically oriented post having a U-shaped end part 16 which engagesaround the horizontal joist, for instance 6, and is anchored thereto inthis manner. The pairs are mutually joined by horizontal joists, forinstance 18, 19. According to a preferred embodiment further verticalposts 20, 21 can also be present which support on the attic floor 22.

In order to obtain an end gable a hip rafter pair 23, 24 can likewise beused which are also coupled to each other and to an adjoining rafterpair by means of vertically welded plates 25.

The roof construction according to the invention can be used as prefabroof. The roof construction can be arranged rapidly and simply. It isalso possible to arrange the roof construction on existing dwellings. Inthe case of roof repair the whole existing roof can for instance beremoved and replaced by the prefabricated system roof according to theinvention.

I claim:
 1. A building provided with a system roof and gable walls,wherein said system roof is comprised of pairs of rafter beams abuttingone another at mutually facing end parts, wherein the rafter beams ofeach pair are disposed sloping in opposing directions, the mutuallyfacing end parts of said beams are provided with coupling means and theother end parts of said beams have substantially upright directed postswith means for connecting to a gable wall having horizontal gable joiststhereupon, and further comprised of substantially horizontal runningjoists mutually connecting the pairs of rafter beams, wherein there aremeans for connecting to a gable wall, which is comprised of an invertedU-shaped part at the end of each upright directed post and the U-shapedpart engages around one of the horizontal gable joists and wherein saidroof system further includes a floor tied to the horizontal gable joiststhereby providing horizontal support to the pairs of rafter beams. 2.The building as claimed in claim 1, wherein the coupling means consistof two standing plates, one welded onto each of a pair of rafter beams,and a nut-bolt connection joining the plates to each other.
 3. Thebuilding as claimed in claim 1, wherein a second vertical post isarranged at a distance from the first post.
 4. The building as claimedin claim 1, further including a hip rafter pair, wherein the mutuallyfacing end parts of the pair have vertically directed plates which areprovided with nut-bolt connections.
 5. The building as claimed in claim2, wherein a second vertical post is arranged at a distance from thefirst post.
 6. The building as claimed in claim 2, further including ahip rafter pair, wherein the mutually facing end parts of the pair havevertically directed plates which are provided with nut-bolt connections.7. The building as claimed in claim 3, further including a hip rafterpair, wherein the mutually facing end parts of the pair have verticallydirected plates which are provided with nut-bolt connections.